<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>练习</title>
    <style>
        #zs {
            color: green;
        }

        .cls {
            color: blue;
        }

        h1 {
            background-color: yellow;
        }

        input[type='submit'] {
            background-color: red
        }

        input[type='button'] {
            color: pink
        }

        * {
            border: 1px solid red;
        }
    </style>
</head>6
<body>
<ul>
    <li id="zs">张三</li>
    <li class="cls">李四</li>
    <li>王五</li>
    <li>赵六</li>
</ul>
<h1 class="cls">孙悟空</h1>
<h1>猪八戒</h1>
<h1>沙和尚</h1>
<h2>李元芳</h2>
<input type="submit">
<input type="button" value="按钮">
</body>
</html>